Google recently launched Team Drives, which allows you to share files between team members. Prior to Team Drives, departments which wanted to share specific files would have had to create a Google Drive folder for their department that all shared files were uploaded to, which would have been an unwieldy way to manage files. More importantly, if a user was deactivated that owned the file, the file could become inaccessible. Uploading a file to Team Drive gives all team members equal access to and ownership of the file.
Team Drive 101
There are now two Drive options with Google Drive. My Drive - which, as per the name, is your individual drive - and Team Drive. Team Drive is a Drive shared between specific members of your organization. If your department had a shared drive before, Team Drive replaces it and makes it easier to share files.